HP-65 goes on hold after reading a card
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11-16-2020, 10:12 AM
Post: #9
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RE: HP-65 goes on hold after reading a card
(11-16-2020 09:46 AM)albertofenini Wrote: but what is WE for ? WE is write enable. In the last image you can see that the signal went low to tell the sense chip that a write is required. That signal stays high for a read. The low signal tells the sense chip that its internal buffers are going to be used to get data from the CRC chip and write it to the card. The high signal tells the sense chip that its internal buffers are going to be used to get data from the card and send it to the CRC chip. The image came from the Classic Notes PDF and there is some more info and oscilloscope traces for card read/writes. cheers Tony |
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